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Remainders

by vongdn » Wed Oct 06, 2010 8:01 pm
If p and n are positive integers and p>n, what is the remainder when p^2 - n^2 is divided by 15?

(1) The remainder when (p+n) is divided by 5 is 1.
(2) The remainder when (p-n) is divided by 3 is 1.


ANSWER --> (1) and (2) together are not sufficient.
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by ramannjit » Wed Oct 06, 2010 8:24 pm
vongdn wrote:If p and n are positive integers and p>n, what is the remainder when p^2 - n^2 is divided by 15?

(1) The remainder when (p+n) is divided by 5 is 1.
(2) The remainder when (p-n) is divided by 3 is 1.


ANSWER --> (1) and (2) together are not sufficient.
Hi,

This questions has been posted earlier.

The following thread may be helpful to you

https://www.beatthegmat.com/gmat-prep-p- ... 24991.html
Ramannjit
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